Air valve for spray guns



Jan. 19, 1937. l W, R, BROWN 2,068,225

i AIR VALVE FOR SPRAY GUNS Filed Dec. 16, 1955 /MMI/A. l0

/i-Emli 3 3 --1111Alglllll'lllnJlllllllll tta ' .Inventor /l/z'llid/z *li-Brown Patented Ian. I9, 19h37* yUNITED STATES PATENT OFFICE 3 Claims.

This invention relates to improvements in spray guns of the suction type designed for use with portable tank units that are equipped with air regulating valves for producing proper spraying pressures, and also adapted to be used on portable compressor units that are not equipped with storage tanks wherein the air is allowed to pass through the frame to the fluid valve.

The main objects of this invention are to provide an improved spray gun of the class described in which the air valve may be set by the manufacturer and is provided with means to prevent its being altered or adjusted without rst dismantling the valve; to provide a spray gun of the class described having an improved air valve adjusting means; and to provide a device of the class described having an air valve which is simple in operation and construction and inexpensive to manufacture.

An illustrative embodiment of this invention is shown in the accompanying drawing in which:

Fig. 1 is a sectional view of my improved spray y gun.

Fig. 2 is a cross sectional view taken on the line 3-3 of Fig. 1.

Fig. 3 is an enlarged cross sectional view of the air valve construction.

Referring in detail to the specific embodiment shown in the drawing my improved spray gun comprises a frame I, an air nozzle 2, an air valve 3, a handle 4, a trigger 5 and a supply container 6 removably secured to an internally threaded cap 'I.

The frame I is provided with an air passageway 8 which is internally threaded as at 9 to receive either a plug I or an air hose, (not shown), leading from the compressor. The

other end of the passageway 8 terminates at and' communicates with a nozzle II. A trigger is pivotally mounted to the frame I as at I2, and is provided with a longitudinal slot I3 through which the needle valve I4 projects. The trigger 5 is also formed and adapted to operate the air valve 3.

The removable one piece air valve 3 comprises a plunger I5 having a slotted head I6 on the end thereof. The plunger is formed and adapted to be mounted in an externally threaded housing I1 which is provided with a hollow polygonal shaped internally threaded head I8. The head I8 is formed and adapted to rest against and seat on a boss I9 formed integral with the upper portion of the handle 4. An air hose from the compressor (not shown) is adapted to be threaded into the Vbe mounted on and surrounds one end of the plunger I5 between the packing 26 and the coupling block 22. The spring tends to normally retain the head I6 on the seat 25, and to constantly compress the packing 26, against the annular,

shoulder 21 to prevent leakage of air forward of the shoulder 21. The housing I'I and the frame I are provided with air passages 28 and 29, respectively, which conduct the compressed air to the air passage B.

It can readily be seen that in the main the amount of air that enters the passageway 8 can be controlled by the manufacturer when he sets the lock nuts 20 and 2I on the housing I'I as the polygonal head I8 will have one of its faces resting and seated on the face of the boss I9 thereby preventing axial rotation of the head I8 without rst removing or loosening the lock nuts 20 and 2I. Minute adjustment means for controlling the amount of air entering passageway 8 may be had by the user by rotating the plunger I5 in either a clockwise or counterclockwise direction.

Although b ut one specific embodiment of this invention is herein shown and described, it'will be understood that details of the construction shown may be altered or omitted Without departing from the spirit of this invention as dened by the following claims:

1. In a device of the class described, a frame, an adjustable valve housing secured in said frame and provided with a head having a flattened face portion, said housing having a bore extending therethrough and having a valve seat, a valve longitudinally movable in said bore arranged to engage said seat, means carried by said frame to reciprocate said valve, and a boss on said frame arranged to engage said face portion of said housing head to prevent runintended rotation of said valve housing.

2. In a device of the class described, a frame, an adjustable valve housing secured in said frame and having a bore extending therethrough and having a valve seat, one end of said housing being provided with a head having a flattened face portion and the other end provided with screw thread means for securing said housing in said frame, a valve longitudinally movable in said bore arranged to engage said seat, means carried by said frame to reciprocate said valve and a boss on said frame arranged to engage said face portion of said valve housing head to prevent unintended rotation of said valve housing.

3. In a device of the class described, a frame, an adjustable valve housing secured in said frame and provided with an axial bore extending therethrough and having a valve seat, one end of said housing being provided with a head having flattened face portion and the other end being provided with screw threads, means cooperative with said screw threads for securing said housing to said frame, a Valve longitudinally movable in said bore arranged to engage said seat, means carried by said frame to reciprocate said valve, and a boss on said frame arranged to engage `said face portion of said housing head to prevent rotation of said valvehousing.

WILLIAM R. BROWN. 

